On classical description of radiation from neutral fermion with anomalous magnetic moment
A. E. Lobanov, O. S. Pavlova
Abstract
Electromagnetic radiation from an uncharged spin 1/2 particle with an anomalous magnetic moment moving in the classical electromagnetic external field originates from quantum spin-flip transitions. Although this process has a purely quantum nature, it was observed for certain particular external field configurations that, when quantum recoil is neglected, the radiation power corresponds to the classical radiation from an evolving magnetic dipole. We argue that this correspondence has a more general validity in the case of an unpolarized particle and derive a general formula for radiation in terms of the external field strength and its derivatives. A classical dynamics of the spin is described by the Bargmann-Michel-Telegdi equation.
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